Ash collector for underfeed stokers



Sept. 28, 1937. H. c. CARTR 2,094,093

ASH COLLECTOR FOR UNDERFEED STOKERS Filed NOV. 25, 193?. 2 Sheets-Sheet l 43 3i Tl,

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Fig- 2 .cgil-Eil /Au/E/v TDF( H. c. CARTER Sept' 28, i937.- H. c. CARTER 2,094,093

ASHA COLLECTOR FOR 'UNDERFEED STOKERS Filed Nov. 25, 1932 2 Sheets-Sheet 2 /kw/E/v TDR H. C CART ER 'Y ma@ sep'c ze, 19a-) y y 2,094,093

ASH COLLECTOR'FOR UNDERFED STOKEBS .c

Haskell c. carter, Portland, oreg'., assigner to UNITED STATES-PATENT, OFFICE Iron Fireman Manufacturing Company, Portland, Oreg.) 1

- Application Ncveml'lcr 2s, 1932. serial Nc. 644,314 l claims. (ci. llc-ics) This invention relates generally to underfeed by the duct end 29. Projecting upwardly from stokers, and particularly to means for collecting the rim 23 are the vertical slicer bars 30 whose and removing ashes therefrom and the depositupper ends travel'around the rim i2. ing of same in conveniently placed ash cans.` f Coal is fed into lthe retort I through the fuel The main object of this invention is the onfeed duct 3| by means of a fuel feed screw 32. 5 struction of an ash remover which will require The duct 3| connects withthe housing 33 whichthe addition of a minimum lnumber of parts in forms the lower lpart of a hopper unit, the deorder to make this feature available on any1 tails of which are explained in my copending apstandard type of underfeed stoker. plication, Serial Number 644,316 led November The second object is to produce an emcient 25, 1932 and now Patent No. 1,974,133 is- 10i form of ash remover which will be exceedingly sued September 18, 1934. In this instance howdurable in its construction and which will have ever, it is` desirable to pass the ash removal duct its working parts easily accessible for inspection 21 through the hpper 34,15hereby forming 2- SUP- and maintenance. port for the duct 21 as well as permitting a more These, and other objecqts, will become'umoreapdesirable alignment thereof.A l 15 parent from the specification following as illus- The worm 26 is driven by means of a sprocket tratedin the accompanying drawings, in which: Y 35 which rests against the bearing 36, preferably Fig. 1 is a side elevation of the stoker. supplied with a grease seal 31. A shear pin 38 Fig. 2 is a plan of Fig. 1 showing portions of secures the sprocket 35 to the worm 26 whose the fuel feed and ash removal ducts broken end 39 is squared to facilitate the insertion of 20 away. l a new pin 38 should same become sheared due Fig. 3 is a section taken along the line 3-3 in to an abnormal load on the ash removal worm Fig. 1. 26. A chain 40 passes ar und the sprocket 35 Fig. 4 is a section takenalong the line I-I in and around a sprocket 4l on the sloping shaft I2 Fig. 2. I which is substantially parallel with the axis oi' 25 Fig. 5 is a section taken along theA line 5--5 in the ash removal worm 26. The shaft 42 is con- Fig. 2. nected by means of a universal joint I3 to a i Fig. 6 is a section taken along the line 6-6. in y power take-oil! 44 which derives its power from I the transmission contained vwithin the housing Fig. 1.

Fig. 7 is afront elevation ofthe device. Y 45, which transmission is driven from` a motor 30 Similar numbers of reference refer to similar I6 through a belt I1. A fan for supplying air Y parts throughout the several views. to the plenum chamber l1 is contained within Referring in detail to the drawings, there is the casing 48. The sprockets 35 and 4I are shown a circular retort l0 above which is contained within 'a casing 4S which is provided mounted a tuyre s601110!! hving an OutWal'dwith a removable cover 50. The sprocket 4l is 1y extending rim l2 which 1S spaced from the secured to the shaft 42 by means of -a shear l inside of the furnace lining I3 which in turn pin 5|,

rests 0n the furnace n01 H- on the floor The` operation of the device is as follows: Asis erected a base g5 pon which rests the floor suming that coalis being fed upwardly into the o 40 i6 of the plenum chamber l1 upon whose side retort m and gradually consumed and that any Walls l. rests the flanged bottom '9 0f the re clinkers projecting beyond the rim I2.,are broken tort I0. The lower portion 20 of the retort on bythe passing of the slicer bars 30. it will .www 1S Preferably .turned t0 rotatably receive be seen met the breken cunkers together with the ash collector ring 2l which is held down by the gne particles wm and their way through the 45 means of the studs 22 which project fromI the openings 52 between thespokes 53 whose upper retOrt W- edges 54 constitute the top side of the ring 2l. The rins 2l hasadownturned rim 23 whose 'rue ashes ss ere permitted te' m1 che space lower edge is provided .with teeth 24 which can around the walls n, as shgwn m Fig, 5, although mesh with the flieht 25.01 'the inclined ash rescme oftlem, cf course, fall directly inte the 50 moval worm 26 which is conined within the ash. ash removal duct 21 and are carried away by the duct 21 whose lowermost end 26 projects intothe wol-nien, others are can-led around by the rospace between the Plenum Chamber Wall i3 and tating ring 2| into the duct 21, from whence they an inner side of the lining I3. j The upper side of und their way through the twg-way chute 56 into the end 28 is cut-away to expose the worm 26. the ash cans 51 through their roof-shaped covers 56 i 'nie lowermost end of the worm 26 is supported 58. By the use oi two cans 51 a greater storage capacity for the ashes is provided and the removal thereof is also facilitated.

While it would seem desirable to provide a cutoi for the ends of the chute 56 to prevent the escape f ashes therefrom while the cans 51 are being emptied, in practice this is not found necessary owing to the extremely slow manner in which these ashes emerge from the stoker.`

It can be seen from the foregoing that by the addition of a relatively small number of parts to the ordinary type of stoker, a'. very satisfactory and inexpensive form of ash remover is made available.

I claim:

1. In an underfeed stoker including a circular retort, in combination, a toothed ash ring rotatably mounted around said retort below the upper edge thereof, a trough-shaped ash removal duct mountedv in an inclined position with its lower end under said toothed ring, an ash removal worm occupying said duct and engaging a tooth of said ring, the upper end of said ash duct being fully enclosed and terminating in a chute, a driving sprocket for said Worm located at the upper end of said duct, and means for rotating said sprocket.

2. In an underfeed stoker having a retort, an ash conveyor comprising a toothed ring rotatably mounted under the outer edge of the retort, a conveyor duct having an open end under said ring, and having a worm Within said duct, the Worm flight meshing with the teeth in said ring, and means for rotating said Worm from the end thereof which is opposite its ring-engaging end.

3. A stoker. having a circular retort provided with a. rotatable ash ring .mounted under the outer edge of the retort, an inclined ash duct having its lower end terminating under said ring,

40 a helical ash removal worm within said duct,

said ring havingteeth thereon which engage the helix of said worm, the lower end of said duct having the upper portion thereof cut away to open to receive ashes conveyed by said ring, an

ash removal worm in said duct engaging said toothed ring for the purpose of driving same, a prime mover, and driving connections between said prime mover and the uppermost end of the worm adapted to deliver 'power thereto.

5. The combination of claim 4, and a plurality of upright slicer bars carried by said toothed ring and having their upper ends disposed around the outer edge of said retort.

6. In an underfeed stoker having a retort, an ash conveyor comprising a ring rotatably mounted under the outer edge of the retort, said ring having downwardly projecting teeth, an ash conveyor duct having an opening under said ring, and a worm within said duct meshing with the teeth of said ring.

7..In an underfeed stoker having a circular retort: an ash leveling device mounted to travel around said retort below the upper edge thereof, said device having teeth, combined conveyor and elevator comprising an inclined ash removal duct mounted with its lower end under said device, an ash removal Worm in said duct'having a flight operatively engaging the teeth of said device whereby to drive the device, and` means for rotating the worm. I

HASKELL C. CARTER. 

